/*
 * Copyright 2002-2009 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package qunar.tc.bistoury.instrument.client.spring.el;

import java.util.Arrays;
import java.util.Collections;
import java.util.Set;

/**
 * Converts an Array to a comma-delimited String.
 * This implementation first adapts the source Array to a List, then delegates to {@link CollectionToStringConverter} to perform the target String conversion.
 *
 * @author Keith Donald
 * @since 3.0
 */
final class ArrayToStringConverter implements ConditionalGenericConverter {

    private final CollectionToStringConverter helperConverter;

    public ArrayToStringConverter(ConversionService conversionService) {
        this.helperConverter = new CollectionToStringConverter(conversionService);
    }

    public Set<ConvertiblePair> getConvertibleTypes() {
        return Collections.singleton(new ConvertiblePair(Object[].class, String.class));
    }

    public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
        return this.helperConverter.matches(sourceType, targetType);
    }

    public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
        return this.helperConverter.convert(Arrays.asList(ObjectUtils.toObjectArray(source)), sourceType, targetType);
    }

}
